DIY O2 Sensor Replacement
#1
Racer
Thread Starter
DIY O2 Sensor Replacement for Bank 1 Sensor 2 CEL P0037 on 2007 RX350 2GR-FE
My CEL light just came on recently at 89K miles, P0037 which from what i read online is "P0037 Lexus - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2".
I think this pretty much means to replace that O2 sensor, right?
I know on the 2GR engines Bank 1 means cylinders 1,3,5 which face the firewall and pretty much everything back there is a pain to get to. has anyone attempted to replace the O2 sensors back there as a DIY? Is this one of those times to just suck it up and take it to a dealer or third party mechanic?
UPDATE WITH DIY INSTRUCTIONS for bank 1 sensor 2 O2 Sensor:
Did this in an hour. I did NOT need to jack the car up. i slid right in from under the drivers side door and had plenty of clearance to work with.
the new O2 sensor was a drop in replacement, exact same wire length and with all of the clips in the exact spots they needed to be. Everything clipped right in. This is the best part, unlike the sienna, highlander and rav 4 DIY's i've seen for this sensor, you don't have to do anything inside the car to wire up the sensor. no need to remove panels, seats, carpets or anything! everything is plug and play beneath!!
I bought this replacement part, DENSO 2344509 (234-4509).
Also got the Oxygen Sensor Socket, LISLE 12390.
Breaker Bar, O2 Sensor Removal socket, ratcheting socket wrench, pliers, flat head screw driver, PB blaster, safety glasses and flash light. Also pictured is the old O2 sensor and the packet of thread grease included with the new O2 sensor
Close up of the o2 sensor removal tool.
1. Using a flathead, stick flathead into bottom of harness and pull back the cabling that's attached to car.
2. Remove the clip from this "horseshoe" looking part by pressing the clips in from the other end
3. the other clip that just needs to be jiggled to be removed. the whole black plastic part gets replaced.
4. Spray some PB blaster and wait 5 minutes. Place the O2 sensor removal socket onto sensor and turn counter clockwise with breaker bar. I braced myself against the front left tire and kicked the breaker bar with my feet to loosen.
old o2 sensor.
5. Not shown: the new o2 sensor comes some gold colored anti seize grease. lube up the o2 sensor threads and screw in the new part. clip everything back together.
Next, put an OBD II scanner into the OBD II port and clear the check engine code. I cleared out my P0037 code with my trusty old scangauge 2. Turn the car on, take it for a test drive. tighten the new o2 sensor and you're good to go
Probably would have paid $450 to get this done at lexus. they wanted $250 for the part.
I got the same part online for around $77 bucks, the o2 socket was $15, and the pb blaster was $5.
Now hopefully bank 1 sensor 1 doesn't crap out, because I think that's tucked all the way back by the firewall. If that happens im just going to suck it up, take it toyota and get my spark plugs replaced at the same time since they probably are going to need to remove the manifold and stuff to get to it!!
I think this pretty much means to replace that O2 sensor, right?
I know on the 2GR engines Bank 1 means cylinders 1,3,5 which face the firewall and pretty much everything back there is a pain to get to. has anyone attempted to replace the O2 sensors back there as a DIY? Is this one of those times to just suck it up and take it to a dealer or third party mechanic?
UPDATE WITH DIY INSTRUCTIONS for bank 1 sensor 2 O2 Sensor:
Did this in an hour. I did NOT need to jack the car up. i slid right in from under the drivers side door and had plenty of clearance to work with.
the new O2 sensor was a drop in replacement, exact same wire length and with all of the clips in the exact spots they needed to be. Everything clipped right in. This is the best part, unlike the sienna, highlander and rav 4 DIY's i've seen for this sensor, you don't have to do anything inside the car to wire up the sensor. no need to remove panels, seats, carpets or anything! everything is plug and play beneath!!
I bought this replacement part, DENSO 2344509 (234-4509).
Also got the Oxygen Sensor Socket, LISLE 12390.
Breaker Bar, O2 Sensor Removal socket, ratcheting socket wrench, pliers, flat head screw driver, PB blaster, safety glasses and flash light. Also pictured is the old O2 sensor and the packet of thread grease included with the new O2 sensor
Close up of the o2 sensor removal tool.
1. Using a flathead, stick flathead into bottom of harness and pull back the cabling that's attached to car.
2. Remove the clip from this "horseshoe" looking part by pressing the clips in from the other end
3. the other clip that just needs to be jiggled to be removed. the whole black plastic part gets replaced.
4. Spray some PB blaster and wait 5 minutes. Place the O2 sensor removal socket onto sensor and turn counter clockwise with breaker bar. I braced myself against the front left tire and kicked the breaker bar with my feet to loosen.
old o2 sensor.
5. Not shown: the new o2 sensor comes some gold colored anti seize grease. lube up the o2 sensor threads and screw in the new part. clip everything back together.
Next, put an OBD II scanner into the OBD II port and clear the check engine code. I cleared out my P0037 code with my trusty old scangauge 2. Turn the car on, take it for a test drive. tighten the new o2 sensor and you're good to go
Probably would have paid $450 to get this done at lexus. they wanted $250 for the part.
I got the same part online for around $77 bucks, the o2 socket was $15, and the pb blaster was $5.
Now hopefully bank 1 sensor 1 doesn't crap out, because I think that's tucked all the way back by the firewall. If that happens im just going to suck it up, take it toyota and get my spark plugs replaced at the same time since they probably are going to need to remove the manifold and stuff to get to it!!
Last edited by evident; 08-09-14 at 05:20 PM. Reason: edited with DIY instructions
The following 3 users liked this post by evident:
#2
O2 sensors are usually quite easy to get to.
one tip for removal, cut the wire close to the sensor so you can fit a deep socket over it, if there isnt room, use the box end of a wrench. an open wrench will usually slip off.
they make special tools for this too, i have one, about 30 bucks.
and dont forget jack stands.
one tip for removal, cut the wire close to the sensor so you can fit a deep socket over it, if there isnt room, use the box end of a wrench. an open wrench will usually slip off.
they make special tools for this too, i have one, about 30 bucks.
and dont forget jack stands.
The following users liked this post:
H8l8n (05-07-24)
#3
Racer
Thread Starter
updated with DIY instructions on how to do this. Mods, can you change the title? Also, not sure why two of the images rotated on their own when i uploaded the pics.
Last edited by evident; 08-08-14 at 12:27 PM.
#5
Driver School Candidate
evident, Thanks a lot for your instructions and pics.
This weekend my wife's rx350 07 engine check in went on and error code called for B1S2, just exactly your situation. The biggest challenge was to locate the sensor and no way I could do it without your thread, including part numbers.
Local store has no idea which one is B1S2.
Good job
This weekend my wife's rx350 07 engine check in went on and error code called for B1S2, just exactly your situation. The biggest challenge was to locate the sensor and no way I could do it without your thread, including part numbers.
Local store has no idea which one is B1S2.
Good job
#6
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Join Date: Dec 2013
Location: Tennessee
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Thank you very much for this detailed tutorial. I had the exact same error code on my wife's 05 RX330. Initially i thought i was going to have to take it in for service and since its due for spark plugs figured i'd go ahead and get that done and break the bank but thanks to your post i was able to target the specific issue and get it resolved for a little under $100 altogether. Thanks again.
#7
Wow, what a find! Same situation as arsharp84, car threw a CEL, scanned - same code for B1S2! Bought the sensor on rockauto. Actually, bought both, B1S2 and B2S2 as I was told to have them both replaced but, it seems that the B2S2 is way up there and hard to get to... Will look and report back if I am able to replace it as well. Question: What size socket is it? I do not have the O2 sensor socket so will follow the tip and just cut the wire to fit a deep socket over the sensor.
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#8
it seems that the B2S2 is way up there and hard to get to... Will look and report back if I am able to replace it as well. Question: What size socket is it? I do not have the O2 sensor socket so will follow the tip and just cut the wire to fit a deep socket over the sensor.
#9
Driver School Candidate
P0051- oxygen sensor bank 2 sensor 1 for RX 350
Dear ALL,
i have problem with oxygen sensor bank 2 sensor 1 for lexus RX 350 model 2009.
Can i anyone help me to find the location for Bank 2 sensor 1 with picture if possible and also the spare part#. for the same.
Appreciate your kind assistance.
i have problem with oxygen sensor bank 2 sensor 1 for lexus RX 350 model 2009.
Can i anyone help me to find the location for Bank 2 sensor 1 with picture if possible and also the spare part#. for the same.
Appreciate your kind assistance.
#10
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Join Date: Oct 2013
Location: iowa
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O2 sensors are usually quite easy to get to.
one tip for removal, cut the wire close to the sensor so you can fit a deep socket over it, if there isnt room, use the box end of a wrench. an open wrench will usually slip off.
they make special tools for this too, i have one, about 30 bucks.
and dont forget jack stands.
one tip for removal, cut the wire close to the sensor so you can fit a deep socket over it, if there isnt room, use the box end of a wrench. an open wrench will usually slip off.
they make special tools for this too, i have one, about 30 bucks.
and dont forget jack stands.
#11
Rookie
iTrader: (1)
In this image, the sensor is at the bottom of the picture. This is taken standing in front of the car, looking down between the engine and radiator. This is a fine piece of <explicative deleted> workmanship from Eastern Catalytic that was not more than 15 months in service.
http://
Last edited by rxpx40; 12-15-16 at 08:06 AM. Reason: adding image
#13
Lead Lap
#14